Android 标签控件

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版本号：1.0

日期：2014.7.24

在有的应用中可能须要设置一些标签来方便用去去查询某些信息，比方手机助手或者购物软件之类都会有一些标签。对于软件开发初期来说，直接使用TextView、Button实现是最为简单的一种方式。可是这样的方法也有其局限性，比方不能控制换行、耦合性低等缺点。所以除了解决这些问题之外，最好能够封装一个类库出来，方便以后使用。

首先新建一个Tag类，

import java.io.Serializable;

public class Tag implements Serializable {
     
      /**
      *
      */
      private static final long serialVersionUID = 2684657309332033242L;
     
      private int backgroundResId ;
      private int id ;
      private boolean isChecked ;
      private int leftDrawableResId ;
      private int rightDrawableResId ;
      private String title;

      public Tag() {
          
     }

      public Tag( int paramInt, String paramString) {
           this .id = paramInt;
           this .title = paramString;
     }

      public int getBackgroundResId() {
           return this .backgroundResId ;
     }

      public int getId() {
           return this .id ;
     }

      public int getLeftDrawableResId() {
           return this .leftDrawableResId ;
     }

      public int getRightDrawableResId() {
           return this .rightDrawableResId ;
     }

      public String getTitle() {
           return this .title ;
     }

      public boolean isChecked() {
           return this .isChecked ;
     }

      public void setBackgroundResId( int paramInt) {
           this .backgroundResId = paramInt;
     }

      public void setChecked( boolean paramBoolean) {
           this .isChecked = paramBoolean;
     }

      public void setId(int paramInt) {
           this .id = paramInt;
     }

      public void setLeftDrawableResId( int paramInt) {
           this .leftDrawableResId = paramInt;
     }

      public void setRightDrawableResId( int paramInt) {
           this .rightDrawableResId = paramInt;
     }

      public void setTitle(String paramString) {
           this .title = paramString;
     }
}

这个类封装了标签视图的背景图片资源、id、是否check等。

然后新建TagView类，继承自ToggleButton，

import com.niceapp.lib.tagview.R;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.ToggleButton;

public class TagView extends ToggleButton {
     
      private boolean mCheckEnable = true;

      public TagView(Context paramContext) {
           super (paramContext);
          init();
     }

      public TagView(Context paramContext, AttributeSet paramAttributeSet) {
           super (paramContext, paramAttributeSet);
          init();
     }

      public TagView(Context paramContext, AttributeSet paramAttributeSet,
               int paramInt) {
           super (paramContext, paramAttributeSet, 0);
          init();
     }

      private void init() {
          setTextOn( null );
          setTextOff( null );
          setText( "" );
          setBackgroundResource(R.drawable. tag_bg );
     }

      public void setCheckEnable( boolean paramBoolean) {
           this .mCheckEnable = paramBoolean;
           if (!this .mCheckEnable ) {
               super .setChecked( false);
          }
     }

      public void setChecked( boolean paramBoolean) {
           if (this .mCheckEnable ) {
               super .setChecked(paramBoolean);
          }
     }
}

这个TagView就是标签视图，标签信息由他来显示。对应的xml文件例如以下，tag.xml:

<? xml version= "1.0" encoding = "utf-8"?>
< com.niceapp.lib.tagview.widget.TagView xmlns:android ="http://schemas.android.com/apk/res/android"
    android:layout_width= "wrap_content"
    android:layout_height= "wrap_content"
    android:drawablePadding= "5.0dip"
    android:minHeight= "0.0dip"
    android:paddingBottom= "4.5dip"
    android:paddingLeft= "20.0dip"
    android:paddingRight= "20.0dip"
    android:paddingTop= "4.5dip"
    android:textColor= "#ff000000"
    android:textSize= "16.0sp" />

显演示样例如以下：

在github上有一个
android-flowlayout
控件，它是依据子视图的大小来动态包裹视图，如图：

因此，控制换行就能够利用这个控件去实现，无需反复发明轮子。android-flowlayout功能实现的类是FlowLayout，所以通过继承这个类来完毕标签控件的实现。

import java.util.ArrayList;
import java.util.List;
import com.niceapp.lib.tagview.R;
import android.content.Context;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.CompoundButton;

/**
* @author kince
* 
*/
public class TagListView extends FlowLayout implements OnClickListener {

     private boolean mIsDeleteMode;
     private OnTagCheckedChangedListener mOnTagCheckedChangedListener;
     private OnTagClickListener mOnTagClickListener;
     private int mTagViewBackgroundResId;
     private int mTagViewTextColorResId;
     private final List<Tag> mTags = new ArrayList<Tag>();

     /**
     * @param context
     */
     public TagListView(Context context) {
          super(context);
          // TODO Auto-generated constructor stub
          init();
     }

     /**
     * @param context
     * @param attributeSet
     */
     public TagListView(Context context, AttributeSet attributeSet) {
          super(context, attributeSet);
          // TODO Auto-generated constructor stub
          init();
     }

     /**
     * @param context
     * @param attributeSet
     * @param defStyle
     */
     public TagListView(Context context, AttributeSet attributeSet, int defStyle) {
          super(context, attributeSet, defStyle);
          // TODO Auto-generated constructor stub
          init();
     }

     @Override
     public void onClick(View v) {
          if ((v instanceof TagView)) {
               Tag localTag = (Tag) v.getTag();
               if (this.mOnTagClickListener != null) {
                    this.mOnTagClickListener.onTagClick((TagView) v, localTag);
               }
          }
     }

     private void init() {

     }

     private void inflateTagView(final Tag t, boolean b) {

          TagView localTagView = (TagView) View.inflate(getContext(),
                    R.layout.tag, null);
          localTagView.setText(t.getTitle());
          localTagView.setTag(t);

          if (mTagViewTextColorResId <= 0) {
               int c = getResources().getColor(R.color.blue);
               localTagView.setTextColor(c);

          }

          if (mTagViewBackgroundResId <= 0) {
               mTagViewBackgroundResId = R.drawable.tag_bg;
               localTagView.setBackgroundResource(mTagViewBackgroundResId);
          }

          localTagView.setChecked(t.isChecked());
          localTagView.setCheckEnable(b);
          if (mIsDeleteMode) {
               int k = (int) TypedValue.applyDimension(1, 5.0F, getContext()
                         .getResources().getDisplayMetrics());
               localTagView.setPadding(localTagView.getPaddingLeft(),
                         localTagView.getPaddingTop(), k,
                         localTagView.getPaddingBottom());
               localTagView.setCompoundDrawablesWithIntrinsicBounds(0, 0,
                         R.drawable.forum_tag_close, 0);
          }
          if (t.getBackgroundResId() > 0) {
               localTagView.setBackgroundResource(t.getBackgroundResId());
          }
          if ((t.getLeftDrawableResId() > 0) || (t.getRightDrawableResId() > 0)) {
               localTagView.setCompoundDrawablesWithIntrinsicBounds(
                         t.getLeftDrawableResId(), 0, t.getRightDrawableResId(), 0);
          }
          localTagView.setOnClickListener(this);
          localTagView
                    .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                         public void onCheckedChanged(
                                   CompoundButton paramAnonymousCompoundButton,
                                   boolean paramAnonymousBoolean) {
                              t.setChecked(paramAnonymousBoolean);
                              if (TagListView.this.mOnTagCheckedChangedListener != null) {
                                   TagListView.this.mOnTagCheckedChangedListener
                                             .onTagCheckedChanged(
                                                       (TagView) paramAnonymousCompoundButton,
                                                       t);
                              }
                         }
                    });
          addView(localTagView);
     }

     public void addTag(int i, String s) {
          addTag(i, s, false);
     }

     public void addTag(int i, String s, boolean b) {
          addTag(new Tag(i, s), b);
     }

     public void addTag(Tag tag) {
          addTag(tag, false);
     }

     public void addTag(Tag tag, boolean b) {
          mTags.add(tag);
          inflateTagView(tag, b);
     }

     public void addTags(List<Tag> lists) {
          addTags(lists, false);
     }

     public void addTags(List<Tag> lists, boolean b) {
          for (int i = 0; i < lists.size(); i++) {
               addTag((Tag) lists.get(i), b);
          }
     }

     public List<Tag> getTags() {
          return mTags;
     }

     public View getViewByTag(Tag tag) {
          return findViewWithTag(tag);
     }

     public void removeTag(Tag tag) {
          mTags.remove(tag);
          removeView(getViewByTag(tag));
     }

     public void setDeleteMode(boolean b) {
          mIsDeleteMode = b;
     }

     public void setOnTagCheckedChangedListener(
               OnTagCheckedChangedListener onTagCheckedChangedListener) {
          mOnTagCheckedChangedListener = onTagCheckedChangedListener;
     }

     public void setOnTagClickListener(OnTagClickListener onTagClickListener) {
          mOnTagClickListener = onTagClickListener;
     }

     public void setTagViewBackgroundRes(int res) {
          mTagViewBackgroundResId = res;
     }

     public void setTagViewTextColorRes(int res) {
          mTagViewTextColorResId = res;
     }

     public void setTags(List<? extends Tag> lists) {
          setTags(lists, false);
     }

     public void setTags(List<? extends Tag> lists, boolean b) {
          removeAllViews();
          mTags.clear();
          for (int i = 0; i < lists.size(); i++) {
               addTag((Tag) lists.get(i), b);
          }
     }

     public static abstract interface OnTagCheckedChangedListener {
          public abstract void onTagCheckedChanged(TagView tagView, Tag tag);
     }

     public static abstract interface OnTagClickListener {
          public abstract void onTagClick(TagView tagView, Tag tag);
     }

}

这个类最要的部分还是inflateTagView这种方法，它将TagView解析出来出来，然后显示出TagListView所要显示的标签。

最后Activity的代码例如以下：

import java.util.ArrayList;
import java.util.List;
import com.niceapp.lib.tagview.widget.Tag;
import com.niceapp.lib.tagview.widget.TagListView;
import android.app.Activity;
import android.os.Bundle;

public class MainActivity extends Activity {

     private TagListView mTagListView;
     private final List<Tag> mTags = new ArrayList<Tag>();
     private final String[] titles = { "安全必备", "音乐", "父母学", "上班族必备", 
               "360手机卫士", "QQ","输入法", "微信", "最美应用", "AndevUI", "蘑菇街" };

     @Override
     protected void onCreate(Bundle savedInstanceState) {
          super.onCreate(savedInstanceState);
          setContentView(R.layout.select_tag_activity);

          mTagListView = (TagListView) findViewById(R.id.tagview);
          setUpData();
          mTagListView.setTags(mTags);
     }

     private void setUpData() {
          for (int i = 0; i < 10; i++) {
               Tag tag = new Tag();
               tag.setId(i);
               tag.setChecked(true);
               tag.setTitle(titles[i]);
               mTags.add(tag);
          }
     }
}

真机显示效果例如以下：